Telephone signaling means.



PATENTED MAR: 14, 1905.

K. WEMAN. TELEPHONE SIGNALING MEANS.

APPLICATION FILED JUNE 4, 1904.

NIH

III mm M N M wi/tmmao UNITED STATES Patented March 14, 1905.

PATENT OFFICE.

KLAS VEMAN, OF NEXV YORK, N. Y.

SPECIFICATION forming part of Letters Patent N0. 784,720, dated March 14, 1905.

Application filed June 4,1904. Serial No. 211,161.

To all whom, it may concern.-

Be it known that I, KLAs \VEMAN, a subject of the King of Sweden and Norway, and a resident of the borough of Manhattan, county and State of New York, have invented certain new and useful Improvements in Telephone Signaling Means, of which the following is a specification.

My invention relates to telephone signaling means, and comprises certain combinations of parts and details of structure hereinafter described and to be particularly pointed out in the claims hereto appended.

The object of my invention is to construct a device of this kind for installation at the central station, (commonly known as a howler,) whereby a signal may be sent from the central station to a subscribers instrument and an audible distinct sound made in the receiver.

The invention is designed to be used on ordinary telephone-lines, so that a signal may be given a subscriber when his receiver is not on the'hook, and is also intended for use on party or similar lines, where the receiver serves the purpose of a receiver proper as well as a signaling instrument. The construction is adaptable to any telephone system.

I further contemplate'so combining the several elements of my invention that irrespecti ve of the different line resistances which may be encountered the pitch of the howler will always be the same.

Referring to the accompanying drawings, wherein like reference characters indicate like parts throughout both views, Figure 1 is a diagrammatic view of a subseribers instrument, the receiver being off the switch-hook; and Fig. 2 is a similar view of my invention installed in a central station.

Referring to Fig. 2 of the drawings, li indicates a suitable key used in connection with the usual cord-circuits (not shown) and hav ing the two springs 9 and 10. D is a source of direct current, such as a battery or the like, and is electrically connected with a relay A, wound to a high resistance and having a high self-induction. In operative connection with the relay A is the armature 1, adapted to contact with the contact-point 2 of the wire leading from the battery to the relay. A wire 1V is run from the relay A and terminates in a contact-point 7, adapted to make contact with the spring 9 of the key. The line connects up with the battery D, and from the opposite side of the battery D the line Z is run, terminating in a contact-point 8, which is adapted to make contact with the spring 10 of the key. At the central station I also provide a small buzzer B, having an armature 5 connected with the armature 1 of the relay. A condenser C is shunted across the breaking contact for the purpose of preventing sparking and consequent burning of the contact. The short wire running from the condenser C terminates in a contact-point (5, resting upon the armature 5 of the buzzer B. The buzzer is connected with the primary P of an inductioncoil 1, the secondary of said induction-coil being connected in series with a condenser C. The condenser C will prevent the flow of any current from the battery through the secondary S.

Referring now to the subscribers instrument, Fig. 1, the switch-hook H is connected by line Y with the spring 9 of-the central key. Resting upon the switch-hook H is the contact-point 3, which forms the terminal of the wire X, running from the switch-hook through the transmitter M, receiver R, and to the spring 10 of the key. 4 is a lower contactpoint which makes contact with the switchhook H when down, and T represents ringers in series with a condenser (1.

The operation of the invention is as follows: Assuming that a call is to be sent from the central station to a subscriber, the key K will be pressed down, thus closing a circuit from the battery D through the relay A, line \V, into the contact-point 7, spring 9, the line Y, hook H, contaet3, transmitter M, receiver R, back over the lineX to the spring 10, through the contact 8, over the line Z, back to the battery D. By the closing of this circuit the armature l of the relay A is attracted to the lat ter, and a second circuit is closed from the battery D over contact 2, armature 1, down the line to armature 5, contact 6, the windings of buzzer B to the primary P of the inductioncoil 1 and back to the battery 1). The closing of this circuit has caused the buzzer B to vibrate at a high pitch. The current passing through the primary P of the induction-coil I has induced a current of very high frequency in the secondary S, and this current readily passes through the condenser C out on the line W, through the spring 9, the line Y, the hook H, transmitter M, receiver R, back over the line X, the key K, and over the wire Z back to the secondary S. The high frequency of this current and the high self-induction of the relay A prevent it from passing through the windings of the relay, and it thus makes its way through the subscribers receiver,

causing the diaphragm to vibrate with high frequency, thus producing a loud and clear tone.

It will be noted from the foregoing that three distinct circuits are formed, the first circuit, starting from the battery D, embracing the switch-hook and receiver and virtually closing the line. The second circuitis of a local nature, operative within the central station for the purpose of actuating the buzzer, and a third circuit, starting from the secondary of the induction-coil and adapted to vibrate the diaphragm of the receiver R.

It will thus be noted that effectual means have been devised for giving the subscriber a call even though his receiver has been left off the hook.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In combination, a battery in circuit with a relay, an armature of said relay in circuit with the armature of a buzzer or current-interrupter, an induction-coil, the primary of which is in circuit with said buzzer, a telephone-receiver in circuit with the secondary of said induction-coil, and means for closing the circuit from the battery to the said receiver, whereby when the buzzer or currentinterrupteroperates, the diaphragm of said receiver will be caused to vibrate, substantially as described.

2. in combination, a battery, a circuit from one pole thereof to the opposite pole, including a relay, a telephone switch-hook, and a receiver, a second circuit from the armature of said relay to the primary of an inductioncoil, said second circuit including a buzzer or current-interrupter and its armature, a third circuit from the secondary of said inductioncoil and back to the secondary, including the said receiver, and means for closing said circuits, whereby when the buzzer or currentinterrupter operates the diaphragm of said receiver Will be caused to vibrate, substantially as described.

3. In combination, a battery, a circuit from one pole thereof to the opposite pole, including a relay, a telephone switch-hook, and a receiver, a second circuit from the armature of said relay to the primary of an inductioncoil, said second circuit including a condenser, a buzzer or current-interrupter and its armature, a third circuit from the secondary of said induction-coil and back to the secondary, including a condenser, the said receiver, and means for closingsaid circuits, whereby, when the buzzer or current-interrupter operates the diaphragm of said receiver will be caused to vibrate, substantially as described.

4:. In combination, a batteryin circuit with a relay, a wire running from said relay and terminating in a contact-point adapted to make contact with a spring-arm, a second wire running from said spring-arm to a telephone switch-hook, a third wire having a contactpiece at one end adapted to make contact with the switch-hook, including in its circuit a tele phone transn'iitter and receiver and terminating at the other end in a second spring arm, a wire from a contact-point, contacting with said second spring-arm, to the battery, a second circuit from the armature of said relay including a buzzer or current-interrupter in line with the primary of an induction-coil, the secondary of said induction-coil being in circuit with said telephone-receiver, and means for closing the circuit from the battery to the receiver, whereby the buzzer or current-interru pter will operate and cause the diaphragm of the receiver to vibrate, substantially as described.

In witness whereof I. have hereunto set my hand in presence of two witnesses.

KLAS \VEMAN.

\Vitnesses:

ErnuL 0. SMITH, lsAn'icLLu MURRAY. 

